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From: dueker@xenon.arc.nasa.gov (Chris Dueker)
Newsgroups: comp.sys.amiga
Subject: Re: Compairing C values
Message-ID: <1991Feb5.173012.20398@nas.nasa.gov>
Date: 5 Feb 91 17:24:12 GMT
References: <rat.3380@hotcity.UUCP>
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In article <rat.3380@hotcity.UUCP>, rat@hotcity.UUCP (P W) writes...
> 
>        I have + as an input arguement via *argv[] and whenever I try to
>compare its value it comes out as a 0.  For instance...  If I compile a
>program like this:
> 
>#include <stdio.h>
>#include <math.h>
> 
>void main(int argc, char *argv[])
> 
>{
> 
>        And I type "test +" (I would name the file test) it would just print a
>equals 0.  Any help would be appereciated...
>char a = argv[1];
>if (a = '+') printf("a equals +");
>if (a = '0') printf("a equals '0'");
>if (a = 0) printf("a equals 0");
>}

Umm, if it's not a typo above, you should use "==" instead of "=" in
the if stmts above.  The "=" assigns the character to variable a, then
if the result is true, the printf stmt is executed.

Chris
P.S.  I'd have expected output from the first two printf's, since those
      results are non-zero (meaning true?).
------------------------------------------------------------------------
"Ah, Benson, you are so mercifully free of the ravages of intellegence!"
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dueker@xenon.arc.nasa.gov        |   Chris Dueker (The Code Slinger)
duke@well.sf.ca.us               |   Mtn. View, CA  (Sillycon Valley!)